JPH0431404B2 - - Google Patents

Abstract

In this coordinate inputting sheet, there are provided an X coordinate inputting sheet for detecting an X coordinate and a Y coordinate inputting sheet for detecting a Y coordinate. These X coordinate and Y coordinate inputting sheets are laid together with their conducting surfaces mutually confronting one another. An insulating projection is provided between the X coordinate inputting sheet and the Y coordinate inputting sheet in order to space apart their opposing conducting surfaces. Auxiliary electrodes extend substantially along equipotential directions of at least one of the X and Y coordinate inputting sheets adjacent to the insulating projection. These auxiliary electrodes may optionally pass on either side of the insulating projection, and in such a case they may be substantially straight or may be curved away from the insulating projection; or, alternatively, the insulating projection may be located on one of the auxiliary electrodes, which may be enlarged to form a disk shaped portion around the insulating projection. In this case, a one of the auxiliary electrodes lying next to the one of the auxiliary electrodes on which the insulating projection is located may be shaped as straight, or alternatively it may be shaped as bowed away from the insulating projection.

Description

[Detailed Description of the Invention] (a) Field of Industrial Use This invention relates to a coordinate input sheet used as an input device for handwritten characters, figures, etc., and more specifically, for inputting figures into a computer,
This invention relates to a coordinate input sheet used when a copy machine specifies and copies a partial area of a printed matter.

(b) Prior art In general, this type of coordinate input sheet has electrodes arranged facing each other on both side edges of an insulating sheet, sheet resistance is formed between the electrodes, and the directions between the electrodes are made to intersect vertically and horizontally. It is composed of an X coordinate sheet and a Y coordinate sheet which are superimposed.

In this case, in order to maintain the insulation between the overlapping sheet surfaces, an insulating protrusion 53 is usually provided between the opposing surfaces of the X coordinate input sheet 51 and the Y coordinate input sheet 52, as shown in FIG. I am intervening. Then, when each of the pressed positions P1 to P5 is pressed down, as shown in FIG.
It is determined from the relationship between the surface resistance values.

However, if the area directly above the insulating protrusion 53 is pressed down, the pressed positions P1 to P4 will be blocked by the insulating protrusion 53, and the corresponding pressing area will be blocked by the insulating protrusion 53.
A situation occurred in which coordinate data that was incorrect was input by pressing R1 to R4, even though the input user had pointed the finger correctly.

In order to solve such problems, a coordinate input sheet in which a conductive film is disposed on the circumferential surface of a deformable insulating protrusion has already been invented, for example, as described in Japanese Utility Model Application Publication No. 59-33564. However, in this conventional configuration, when the above-mentioned insulating protrusion is pressed through the sheet, a pressing force is applied to the conductive coating at the same time as the insulating protrusion deforms, so the conductive coating deteriorates quickly and the durability and There was a problem with extremely poor reliability.

(c) Purpose of the Invention This invention not only enables accurate detection and input of the pressed position even when pressed on an insulating protrusion, but also improves durability and provides high reliability. The purpose is to provide a coordinate input sheet that can secure the

(D) Structure of the Invention This invention provides an insulating protrusion interposed between the opposing surfaces of an ordinate input sheet and an abscissa input sheet, each having a pair of electrodes on both the left and right sides, to space them apart at a constant interval. The coordinate input sheet is a coordinate input sheet that is overlapped with the above-mentioned pair of electrodes, and includes a plurality of auxiliary electrodes arranged in parallel between the pair of electrodes, and the auxiliary electrode portion of the auxiliary electrodes located near the insulating protrusion is connected to the insulating protrusion. The coordinate input sheet is characterized in that the auxiliary electrode section is curved in the horizontal direction and in the equipotential direction within a range that allows input errors.

(e) Effects of the Invention According to the present invention, even if when pressing down on an insulating protrusion, the direction of the press is obstructed by the protrusion and deviates around the protrusion, the auxiliary electrode is arranged at the deviated position. Therefore, the pressed position can be accurately detected via this auxiliary electrode.

Therefore, the deviation of the pressed position with respect to the coordinate input sheet is eliminated, the input position becomes highly accurate, and the coordinates of the finger input point can be accurately input into a computer or the like.

Moreover, since the predetermined auxiliary electrode part of the auxiliary electrode mentioned above is curved in the horizontal direction and the equipotential direction within a range that allows input error around the insulating protrusion, the deformation due to the application of pressing force is slight. ,
This has the effect of not only increasing the lifespan but also ensuring high reliability.

(F) Embodiment of the Invention An embodiment of the invention will be described in detail below based on the drawings.

The drawing shows a coordinate input sheet 11 used as a digitizer pad for input operations by writing characters and figures on the top surface of the sheet. It is composed of an ordinate input sheet 12 for detecting coordinates, and a horizontal coordinate input sheet 13 for detecting coordinates in the horizontal direction.

The ordinate input sheet 12 is made by screen-printing anode and cathode electrodes 15, 15 (see Fig. 3) on a flexible insulating sheet 14, such as a polyester film, in parallel on both left and right sides using silver paste. death,
Furthermore, an insulating sheet 14 between these electrodes 15, 15
On top, auxiliary electrodes 16 made of screen-printed lines of silver paste or the like having good electrical conductivity are arranged in parallel at appropriate intervals.

By providing this auxiliary electrode 16, the equipotential performance and the linearity of the current flowing in that direction are improved, and a homogeneous resistance sheet surface necessary for positioning is formed.

Furthermore, a resistive material 17 such as carbon resin is uniformly printed on the upper surface of the insulating sheet 14 on which these auxiliary electrodes 16 are arranged in parallel.

In addition, on the top surface of the ordinate input sheet 12, there is a cover sheet 18 for input display on which characters and figures are written.
and top sheet 19 are installed overlappingly.

On the other hand, the abscissa input sheet 13 is formed to have a structure mainly composed of two layers, an insulating sheet 14 and a resistance material 17 layer, which are substantially the same as the ordinate input sheet 12 described above. By arranging them facing each other with their respective auxiliary electrodes 16 perpendicular to each other, the coordinate input sheet 1
1 is configured.

Incidentally, on the ordinate input sheet 13 side, small insulating projections 20 are uniformly distributed on the upper surface of the insulating sheet 14 in order to insulate the opposing surfaces of both the coordinate input sheets 12 and 13.

Moreover, in the auxiliary electrode portion 16a of the auxiliary electrode 16 located near the insulating protrusion 20,
As shown in FIG. 2, the auxiliary electrode portion 16a is curved horizontally and in the equipotential direction within a range that allows input error, while surrounding the insulating protrusion 20 described above. In addition, in the figure, 21 is an electrode connection part, and V is a DC power supply.

When the coordinate input sheet 11 configured in this manner receives pen pressure on the top surface of the coordinate input sheet 11, the pressed position based on the pen pressure becomes the ordinate position on the ordinate input sheet 12 on the top surface side. , and the abscissa position on the abscissa input sheet 13 on the lower surface side are detected in correspondence with the resistance values of the resistive material 17 layers, respectively, and as a result, the pressed position is determined.

At this time, even if the pressed position of the pen pressure corresponds to the insulating protrusion 20 and the pressed position is shifted around the insulating protrusion 20, at least one of the auxiliary electrodes located on both sides of the insulating protrusion 20 16, and the pressed position can be accurately detected as being within the allowable input error range.

Moreover, as shown in FIG. 2, the predetermined auxiliary electrode portion 16a of the auxiliary electrode 16 is curved in the horizontal direction and in the equipotential direction around the insulating protrusion 20 within a range that allows input error. The deformation is slight even when the temperature is applied, and as a result, it is possible to prolong the life and ensure high reliability.

FIG. 4 shows another embodiment, in which a similarly curved auxiliary electrode portion 16a is arranged closer than the previous embodiment within a range that allows input error when pressed down with the insulating protrusion 20 as the center. Insulating protrusion 2
A portion 16a of the auxiliary electrode 16, which is arranged in parallel equipotential directions with both sides of the auxiliary electrode 16 interposed therebetween, is provided in a curved manner.

By arranging the auxiliary electrode portion 16a closer to the insulating protrusions 20 in this way, the accuracy of the detection position relative to the depressed portion of the insulating protrusions 20 can be further improved.

As described above, when pressing down on the insulating protrusion 20, even if the direction of the press is obstructed by the insulating protrusion 20 and shifts around the insulating protrusion 20, the auxiliary electrode 16 is disposed at the shifted position. Therefore, the pressed position can be accurately detected via this auxiliary electrode 16.

As a result, the displacement of the pressed position with respect to the surface of the coordinate input sheet 11 is eliminated, the input position becomes highly accurate, and the coordinates of the input point can be accurately input into a computer or the like.

This embodiment also has the same effects as the previous embodiment, so the same parts in FIG. 4 as in FIG. 2 are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an enlarged longitudinal sectional view of the main parts of the coordinate input sheet, FIG. 2 is an enlarged plan view of the main parts of the coordinate input sheet, and FIG. 3 is an exploded perspective view of the coordinate input sheet. 4 is a plan view of the main part of a coordinate input sheet showing another embodiment of the present invention, FIG. 5 is an enlarged longitudinal sectional view of the main part of a conventional coordinate input sheet, and FIG. 6 is a conventional coordinate input sheet. FIG. 2 is an explanatory diagram showing a press-responsive state of . 12... Ordinate input sheet, 13... Abscissa input sheet, 15... Electrode, 16... Auxiliary electrode, 1
6a... Auxiliary electrode part, 20... Insulating protrusion.

Claims (1)

[Claims] 1. Insulating protrusions 2 that space the facing surfaces of the ordinate input sheet 12 and the abscissa input sheet at a constant interval, each having a pair of electrodes 15, 15 on both the left and right sides.
It is a coordinate input sheet in which 0 is interposed between these sheets 12 and 13 and overlapped, and includes a plurality of auxiliary electrodes 16 arranged in parallel between the pair of electrodes 15 and 15, and this auxiliary electrode 16 Among them, the auxiliary electrode part 16a located near the insulating protrusion 20,
A coordinate input sheet that surrounds the insulating protrusion 20 and has the auxiliary electrode section 16a curved in the horizontal direction and in the equipotential direction within a range that allows input errors.